[yukonho]

I have been charged with the task of re-fitting a CNC lathe. It was previously CNC, andI will need to replace all of the drive electronics except for the power supply.
It is one sweet little lathe, incredibly well built.
It is equipped with ball screws, I haven't measured the pitch yet, but I am guessing 5 TPI. It is stiff to turn the ballscrews by hand, but I am certain it is just the preload. It is a tight little machine. It will never be heavily used, mainly just jog the carriage and tailstock. I may have to make a third axis for moving a forming tool into place.
I have measured the existing mounting holes, shaft length and diameter etc.
I am looking for help on the following..
What torque motors should I be looking for?
I know I can use a very lightweight motor for the third axis, can I mix servos on one driver board?
Which driver boards are the best choices these days? (money is not a big concern on this, quality is)
I will need inputs for RPM and for 5 limit/home switches if possible.
Where can I get good shaft couplers? The ballscrews are 12mm diameter.

The holes on the mounting plates are 62mm across (corner to corner) and the servos will have to be 7.5" long or less (body, not including shaft)

Thanks for any help, I have a fair amount of experience with steppers, but this is my first application for servos.